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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Quantitative analysis of pulsed ultrasonic beam patterns using a schlieren system
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Quantitative analysis of pulsed ultrasonic beam patterns using a schlieren system

机译：使用schlieren系统对脉冲超声束方向图进行定量分析

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The acoustic output from pulsed ultrasonic transducers has traditionally been analyzed with a hydrophone. Recently, a new faster technique has been developed using the principles of optical diffraction. This schlieren method allows the direct two-dimensional visualization of the ultrasonic beam as a pulse train. In order to obtain quantitative information in the form of temporal-average acoustic intensity, however, tomographic reconstruction has to be performed. In this study, tomographic reconstruction was achieved by acquiring 250 images over a 180/spl deg/ angle. Automation of the measurement was obtained by using a frame grabber, a stepper motor, and digital delays all controlled by an IBM-compatible computer. Comparisons of the schlieren results to those obtained by a hydrophone are made in terms of both the -3 dB beamwidths and axial profiles. The results demonstrate that the schlieren method may be a more time efficient alternative for the characterization of ultrasonic transducers.
机译：传统上，使用水听器分析脉冲超声换能器的声音输出。近来，已经使用光学衍射原理开发了一种新的更快的技术。这种schlieren方法可以将超声波束直接二维可视化为脉冲序列。然而，为了获得时间平均声强形式的定量信息，必须进行层析成像重建。在这项研究中，层析成像重建是通过在180 / spl度/角度上采集250张图像来实现的。通过使用帧捕获器，步进电机和数字延迟器（全部由IBM兼容计算机控制）来实现测量的自动化。在-3 dB波束宽度和轴向剖面方面，对schlieren结果与水听器得到的结果进行了比较。结果表明，schlieren方法对于超声换能器的表征可能是更省时的选择。

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